Fix niceNum implementation

[danmooney2]

Description

Previous state hardcoded the thousands separators. I'm not sure which locale uses an apostrophe (') as a thousands separator but for the majority of the world that is not correct. Number.prototype.toLocaleString will format numbers based on user's locale.

Source: https://docs.oracle.com/cd/E19455-01/806-0169/overview-9/index.html

Related Issue

Motivation and Context

Readability

How Has This Been Tested?

Locally

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.